Have you tried Lyrica? It is similar to gabapentin in action. It does list weight gain as a possible side effect but that does not occur in everyone.
I have been taking gabapentin for 3.5 years. In that time I have lost over 40 pounds. Gabapentin does cause fluid retention. I have found that if I watch my salt intake and drink plenty of fluids, I do not retain water from it. I have to take Tramadol with my Neurontin to get effective pain relief. I have been taking the gabapentin-traadol combo for over 2 years.
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CD, Ankylosing Spondylitis, small fiber peripheral neuropathy, avascular necrosis, diffuse connective tissue disease, Sjogren's Syndrome ?